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SN2019dge : A Helium-rich Ultra-stripped Envelope Supernova
- Yao, Yuhan (author)
- De, Kishalay (author)
- Kasliwal, Mansi M. (author)
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- Ho, Anna Y. Q. (author)
- Schulze, Steve (author)
- Li, Zhihui (author)
- Kulkarni, S. R. (author)
- Fruchter, Andrew (author)
- Rubin, David (author)
- Perley, Daniel A. (author)
- Fuller, Jim (author)
- Piro, Anthony L. (author)
- Fremling, C. (author)
- Bellm, Eric C. (author)
- Burruss, Rick (author)
- Duev, Dmitry A. (author)
- Feeney, Michael (author)
- Gal-Yam, Avishay (author)
- Golkhou, V. Zach (author)
- Graham, Matthew J. (author)
- Helou, George (author)
- Kupfer, Thomas (author)
- Laher, Russ R. (author)
- Masci, Frank J. (author)
- Miller, Adam A. (author)
- Rusholme, Ben (author)
- Shupe, David L. (author)
- Smith, Roger (author)
- Soumagnac, Maayane T. (author)
- Zolkower, Jeffry (author)
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- (creator_code:org_t)
- 2020-08-31
- 2020
- English.
- In: Astrophysical Journal. - : American Astronomical Society. - 0004-637X .- 1538-4357. ; 900:1
- Journal article (peer-reviewed)
Abstract
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- We present observations of ZTF18abfcmjw (SN2019dge), a helium-rich supernova with a fast-evolving light curve indicating an extremely low ejecta mass (approximate to 0.33M(circle dot)) and low kinetic energy (approximate to 1.3 x 10(50)erg). Early-time (<4 days after explosion) photometry reveals evidence of shock cooling from an extended helium-rich envelope of similar to 0.1 M-circle dot located similar to 1.2 x 10(13) cm from the progenitor. Early-time He II line emission and subsequent spectra show signatures of interaction with helium-rich circumstellar material, which extends from greater than or similar to 5 x 10(13)cm to greater than or similar to 2 x 10(16)cm. We interpret SN2019dge as a helium-rich supernova from an ultra-stripped progenitor, which originates from a close binary system consisting of a mass-losing helium star and a low-mass main-sequence star or a compact object (i.e., a white dwarf, a neutron star, or a black hole). We infer that the local volumetric birth rate of 19dge-like ultra-stripped SNe is in the range of 1400-8200 Gpc(-3)yr(-1) (i.e., 2%-12% of core-collapse supernova rate). This can be compared to the observed coalescence rate of compact neutron star binaries that are not formed by dynamical capture.
Subject headings
- NATURVETENSKAP -- Fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences (hsv//eng)
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- ref (subject category)
- art (subject category)
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- Yao, Yuhan
- De, Kishalay
- Kasliwal, Mansi ...
- Ho, Anna Y. Q.
- Schulze, Steve
- Li, Zhihui
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- Kulkarni, S. R.
- Fruchter, Andrew
- Rubin, David
- Perley, Daniel A ...
- Fuller, Jim
- Piro, Anthony L.
- Fremling, C.
- Bellm, Eric C.
- Burruss, Rick
- Duev, Dmitry A.
- Feeney, Michael
- Gal-Yam, Avishay
- Golkhou, V. Zach
- Graham, Matthew ...
- Helou, George
- Kupfer, Thomas
- Laher, Russ R.
- Masci, Frank J.
- Miller, Adam A.
- Rusholme, Ben
- Shupe, David L.
- Smith, Roger
- Sollerman, Jespe ...
- Soumagnac, Maaya ...
- Zolkower, Jeffry
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- NATURAL SCIENCES
- NATURAL SCIENCES
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- Stockholm University
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